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为了找出伺服阀的温漂电流波动的原因,考虑到温度对主阀芯的影响,从仿真中阐述了阀芯楔形膨胀的变化规律,将阀芯轴向局部温度分布简化为一维稳态导热问题,推导了阀芯与阀套间隙的楔形变化规律表达式.在此基础上,利用滑阀间隙的流动规律,推导出了滑阀楔形变形下的库伦摩擦力表达式,得出了在库伦摩擦力下伺服阀的电流变化量.最后,通过理论分析和试验进行了对比,证明了伺服阀温漂电流的波动与温升引起的伺服阀内部非线性摩擦有关.
In order to find out the cause of the temperature drift of the servo valve, taking into account the influence of temperature on the main spool, the variation of the wedge expansion of the spool was explained from the simulation. The axial temperature distribution in the spool was simplified to one-dimensional steady state Thermal conductivity, the wedge-shaped regular expression of clearance between valve plug and valve sleeve was deduced.On this basis, by using the flow law of the valve spool clearance, the Coulomb friction expression of sliding valve wedge deformation was deduced, Finally, the comparison between the theoretical analysis and the experiment shows that the fluctuation of the servo valve temperature drift current is related to the non-linear friction in the servo valve caused by the temperature rise.